Gore, M., & Stubbe, J. (1988). Elements of systems analysis (4th ed.). Wm. C. Brown.
Lua i Stíl Chicago (17ú heag.)Gore, Marvin, agus John Stubbe. Elements of Systems Analysis. 4th ed. Dubuque, Iowa: Wm. C. Brown, 1988.
Lua MLA (9ú heag.)Gore, Marvin, agus John Stubbe. Elements of Systems Analysis. 4th ed. Wm. C. Brown, 1988.
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